The U.S. economy grew quickly at the end of 2013 — but is it sustainable?

The Commerce Department announced strong GDP numbers for the fourth quarter last year, but the market remains unsettled

Yellen
(Image credit: (AP Photo/Charles Dharapak))

American gross domestic product, the broadest measure of economic activity, grew at a seasonally adjusted annual rate of 3.2 percent in the fourth quarter, the Commerce Department said Thursday, in line with economists' estimates.

Overall, activity expanded 3.7 percent in the second half of 2013, significantly higher than the 1.8 percent pace in the first half of the year, and the strongest second-half growth since 2003, when activity expanded 5.8 percent.

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John Aziz is the economics and business correspondent at TheWeek.com. He is also an associate editor at Pieria.co.uk. Previously his work has appeared on Business Insider, Zero Hedge, and Noahpinion.